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. Author manuscript; available in PMC: 2013 Dec 17.
Published in final edited form as: Chem Res Toxicol. 2012 Oct 16;25(12):2642–2653. doi: 10.1021/tx3002753

Fig. 6.

Fig. 6

LC-MS/MS analysis of the nitrated peptide 425DNIDYIYFGSSPR440. The predicted b and y fragment ion series for the singly charged ion with MH+ at m/z 1903.0 for the modified peptide are indicated in the top panel. Data presented are from the MS/MS spectra of the precursor ion with [M+2H]+2 at m/z 951.6 obtained in positive mode using the Xcalibur software. The observed ions for the modified peptide are “shown in red” as described in the text. Doubly charged fragment ions y12, y13, y14 and y15 are also observed. The modified residue is indicated by the asterisk.